#ifndef JOS_INC_ELF_H
#define JOS_INC_ELF_H

#include <inc/types.h>

#define ELF_MAGIC 0x464C457FU /* "\x7FELF" in little endian */

struct Elf {
  uint32_t e_magic;  // must equal ELF_MAGIC
  uint8_t e_elf[12];
  uint16_t e_type;
  uint16_t e_machine;
  uint32_t e_version;
  uint32_t e_entry;
  uint32_t e_phoff;
  uint32_t e_shoff;
  uint32_t e_flags;
  uint16_t e_ehsize;
  uint16_t e_phentsize;
  uint16_t e_phnum;
  uint16_t e_shentsize;
  uint16_t e_shnum;
  uint16_t e_shstrndx;
};

struct Proghdr {
  uint32_t p_type;
  uint32_t p_offset;
  uint32_t p_va;
  uint32_t p_pa;
  uint32_t p_filesz;
  uint32_t p_memsz;
  uint32_t p_flags;
  uint32_t p_align;
};

struct Secthdr {
  uint32_t sh_name;
  uint32_t sh_type;
  uint32_t sh_flags;
  uint32_t sh_addr;
  uint32_t sh_offset;
  uint32_t sh_size;
  uint32_t sh_link;
  uint32_t sh_info;
  uint32_t sh_addralign;
  uint32_t sh_entsize;
};

// Values for Proghdr::p_type
#define ELF_PROG_LOAD 1

// Flag bits for Proghdr::p_flags
#define ELF_PROG_FLAG_EXEC 1
#define ELF_PROG_FLAG_WRITE 2
#define ELF_PROG_FLAG_READ 4

// Values for Secthdr::sh_type
#define ELF_SHT_NULL 0
#define ELF_SHT_PROGBITS 1
#define ELF_SHT_SYMTAB 2
#define ELF_SHT_STRTAB 3

// Values for Secthdr::sh_name
#define ELF_SHN_UNDEF 0

#endif /* !JOS_INC_ELF_H */
